EP0200191A3 - Read circuit for floppy disk drive - Google Patents

Read circuit for floppy disk drive Download PDF

Info

Publication number
EP0200191A3
EP0200191A3 EP86105841A EP86105841A EP0200191A3 EP 0200191 A3 EP0200191 A3 EP 0200191A3 EP 86105841 A EP86105841 A EP 86105841A EP 86105841 A EP86105841 A EP 86105841A EP 0200191 A3 EP0200191 A3 EP 0200191A3
Authority
EP
European Patent Office
Prior art keywords
read circuit
switch
disk drive
floppy disk
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP86105841A
Other languages
German (de)
French (fr)
Other versions
EP0200191A2 (en
Inventor
Hiroshi C/O Patent Division Suzuki
Shouji Nakajima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Toshiba Computer Engineering Corp
Original Assignee
Toshiba Corp
Toshiba Computer Engineering Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP60093246A external-priority patent/JPS6242305A/en
Priority claimed from JP60142154A external-priority patent/JPS623411A/en
Application filed by Toshiba Corp, Toshiba Computer Engineering Corp filed Critical Toshiba Corp
Publication of EP0200191A2 publication Critical patent/EP0200191A2/en
Publication of EP0200191A3 publication Critical patent/EP0200191A3/en
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/012—Recording on, or reproducing or erasing from, magnetic disks
    • G11B5/016—Recording on, or reproducing or erasing from, magnetic disks using magnetic foils

Abstract

In a read circuit for an FDD, a differentiator is constituted by a pair of current control transistors (15, 17) connected differentially, and a series circuit of a capacitor (23), an inductor (25), and first and second resistors (27, 29) con­ nected between the transistors (15, 17). A switch is con­ nected across one (29) of the resistors (27, 29). When a track counter (34) detects an inner track, it supplies an active signal to the switch. The switch is closed to short-circuit the resistor (29), thereby decreasing the damping value of the differen­ tiator.
EP86105841A 1985-04-30 1986-04-28 Read circuit for floppy disk drive Ceased EP0200191A3 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP93246/85 1985-04-30
JP60093246A JPS6242305A (en) 1985-04-30 1985-04-30 Floppy disc device
JP142154/85 1985-06-28
JP60142154A JPS623411A (en) 1985-06-28 1985-06-28 Reading circuit for floppy disk device

Publications (2)

Publication Number Publication Date
EP0200191A2 EP0200191A2 (en) 1986-11-05
EP0200191A3 true EP0200191A3 (en) 1988-09-21

Family

ID=26434664

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86105841A Ceased EP0200191A3 (en) 1985-04-30 1986-04-28 Read circuit for floppy disk drive

Country Status (3)

Country Link
US (1) US4722010A (en)
EP (1) EP0200191A3 (en)
KR (1) KR900001594B1 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3800827C2 (en) * 1988-01-14 1993-11-18 Broadcast Television Syst Device for transmitting signals for a magnetic recording / reproduction device
US5315450A (en) * 1988-08-02 1994-05-24 Teac Corporation Dual head type magnetic disk recording/reproducing apparatus
JPH075524Y2 (en) * 1988-11-14 1995-02-08 ローム株式会社 Magnetic recording circuit
US5157559A (en) * 1989-04-26 1992-10-20 Vtc Inc. Adjustable bandwidth differentiating amplifier for a magnetic disk drive
US5032934A (en) * 1989-08-18 1991-07-16 Teac Corporation Magnetic disc apparatus with a cosine equalizer and specific gap length head
JPH0439863U (en) * 1990-07-25 1992-04-03
JPH05120616A (en) * 1991-10-25 1993-05-18 Teac Corp Disk device
TW222029B (en) * 1991-12-18 1994-04-01 Philips Nv
US5327302A (en) * 1992-09-16 1994-07-05 At&T Bell Laboratories Data filter tuning for constant density recording applications
US5671098A (en) * 1995-06-01 1997-09-23 Maxtor Corporation Adaptive preamplifier for resonance tuning useful in a disk drive
US6307693B1 (en) * 1995-10-13 2001-10-23 Sony Corporation Integration of filter into read/write preamplifier integrated circuit
US5808435A (en) * 1996-05-28 1998-09-15 Kmy Instruments Micropositioning device for disk head testing system
US6680809B1 (en) 2000-10-12 2004-01-20 International Business Machines Corporation Write head current damping with dynamic coupling
US6697204B2 (en) * 2001-05-25 2004-02-24 Infineon Technologies Ag Method and apparatus for operating a continuous time filter of a read/write channel for a hard disk drive
US6747837B1 (en) * 2001-08-31 2004-06-08 Western Digital Technologies, Inc. Disk drive comprising an integrator for controlling a VCM actuator and transformer for controlling a piezoelectric actuator
US6952322B1 (en) 2002-11-27 2005-10-04 Western Digital Technologies, Inc. Disk drive reading servo sectors recorded at a relative offset on multiple disk surfaces to increase the servo sample rate

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2933004A1 (en) * 1978-08-16 1980-03-27 Hitachi Ltd TAPE DEVICE
US4244008A (en) * 1979-07-30 1981-01-06 Siemens Corporation Read back compensation circuit for a magnetic recording device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58102316A (en) * 1981-12-14 1983-06-17 Fujitsu Ltd Differentiating circuit of magnetic disk device
JPS59129909A (en) * 1983-01-13 1984-07-26 Seiko Epson Corp Differentiating circuit
US4564869A (en) * 1983-11-21 1986-01-14 Eastman Kodak Company Zoned equalization for a magnetic disc
JPS618774A (en) * 1984-06-22 1986-01-16 Hitachi Ltd Reading circuit of magnetic and recording device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2933004A1 (en) * 1978-08-16 1980-03-27 Hitachi Ltd TAPE DEVICE
US4244008A (en) * 1979-07-30 1981-01-06 Siemens Corporation Read back compensation circuit for a magnetic recording device

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 154 (P-463)[2210], 4th June 1986, & JP-A-61 008 774 (HITACHI SEISAKUSHO) 16-01-1986 *
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 206 (P-222)[1351], 10th September 1983; & JP-A-58 102 316 (FUJITSU K.K.) 17-06-1983 *
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 259 (P-317)[1696], 28th November 1984; & JP-A-59 129 909 (SUWA SEIKOSHA K.K.) 26-07-1984 *

Also Published As

Publication number Publication date
EP0200191A2 (en) 1986-11-05
KR900001594B1 (en) 1990-03-15
US4722010A (en) 1988-01-26
KR860008495A (en) 1986-11-15

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Inventor name: NAKAJIMA, SHOUJI

Inventor name: SUZUKI, HIROSHIC/O PATENT DIVISION